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JEE Advanced 2022Paper 1
Exam
JEE Advanced
Year
2022
Paper
Paper 1
Subject
Physics
Chapter
Alternating Current

JEE Advanced 2022 · Paper 1 · Physics · Alternating Current

Consider an LC circuit, with inductance L = 0 . 1H and capacitance...

Consider an LCLC circuit, with inductance L=0.1HL = 0 . 1H and capacitance C=10−3FC = {10}^{- 3}F, kept on a plane. The area of the circuit is 1m21{m}^{2}. It is placed in a constant magnetic field of strength B0{B}_{0} which is perpendicular to the plane of the circuit. At time t=0t = 0, the magnetic field strength starts increasing linearly as B=B0+\betatB = {B}_{0} + \betat with β=0.04Ts−1\beta = 0 . 04T{s}^{- 1}. The maximum magnitude of the current in the circuit is____mAmA.Consider an LC circuit, with inductance L = 0 . 1H and capacitance C = 10 ^ - 3 F , kept on a plane. The area of the

Correct answer

0

Step-by-step solution

Emf induced in the circuit is

∣E∣=∣dϕdt∣=ddt[(B0+\betat)A]\left|E\right| = \left|\dfrac{dϕ}{dt}\right| = \dfrac{d}{dt}\left[\left({B}_{0} + \betat\right)A\right]

=β×A= \beta \times A

=0.04V= 0 . 04V

So the circuit can be rearranged as

Consider an LC circuit, with inductance L = 0 . 1H and capacitance C = 10 ^ - 3 F , kept on a plane. The area of the

Using Kirchhoff's law we can write

E=Ldidt+qCE = L\dfrac{di}{dt} + \dfrac{q}{C}

Ldidt=E−qCL\dfrac{di}{dt} = E - \dfrac{q}{C}

For maximum current, didt=0\dfrac{d i}{d t} = 0,

Or q=CEq = CE

Using work energy theorem,

qE=12Li2+q22CqE = \dfrac{1}{2}L{i}^{2} + \dfrac{{q}^{2}}{2C}

At {i}_\max, CEE = \dfrac{1}{2}L{i}_\max^{2} + \dfrac{{E}^{2}{C}^{2}}{2C}

Or, {i}_\max = \sqrt{\dfrac{C}{L}}E

So, {i}_\max = \sqrt{\dfrac{{10}^{- 3} \times 0 . 04}{0 . 1 \times {10}^{- 3}}}=4mA= 4mA

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